Electromagnet.



No. 892,065. P ATE N-TED JUNE 30, 1908.

n. L. LINDQUIST. ELEGTR-OMAGNET.

' APPLIOATION FILED JUNE 14, 1906.

earner oirrron DAVID L. LINDQUZST, OFY ONKEBS, NEW YORK.

his. seaoos.

Specification 02 Letters ?atent.

Patented. June 30, 1908.

Application filed June is, 1995. Eerie} No. 265,280

, lowing is a specification.

The invention relates to an electro-magnet to be operated by a varyingor alternating current without chattering or similar noises resulting byreason of vibrations of the arrpature due to current variations its 001The rinciple of the invention resides in the inec anical equilibrationof-the armature against the attraction of the magnet and the takingup ofthe vibrations thereof due to current variations by means of a suitablyplaced resilient body forming the abutment of said armature. It will beobserved, therefore, that l do not prevent the armature vibrations by anconstruction of the magnet coil itself anc thus avoid chattering; but onthe contrary 1 permit them, I stoo their eil'ect upon contacts or anyother rigi members controlled by the armature by stopping them out,through the mechanical balancing lid of the armature against the magnetpull and their absorption. by the inter posed resilient abutment.

The accompanying drawing is an elevation of my improved varying currentmagnet,

The core 13 carries on one arm the electromagnet coil A and to its otherarm is pivoted the" armature C. Said coil is su ported in any suitableway upon the back ate D, and projecting from said plate is a i ed arm Esupporting the rods F. The armature C carries a rod G- upon which ismounted a freely sliding plate H. Between said plate H and a flangedsleeve 1 of insulatin material, is interposed a helical spring whichnormally sets the late H outward against its retaining pin The plate Handrods F form circuit terminals, and when in contact establish circuitfrom the, conduetor to conductor, said conductors bein; connectedrespectively to rod G and arm The elect-r0 magnet coil is connected incircuit with a source of varying current that may be derived from analternating current generator as symbolically indicated at L.

lhe sprin J is to be so constructed as mechanica ly to equilibrate thearmature against the pull of the electro magnet, and so to form theabutmentfor said armature.

. Hence when the armature is attracted to close circuit at the terminalsH, F, no solid part of it meets any solid or fixed part of the apparatusagainst which it can chatter. After contact has been established at theterminals, and the armature has become equilibrated, the spring willthen still further operate to take up such vibrations of the armature asmay be caused by current vari- 'ations in the coil B, and in this waysaid vibrations are stopped from reaching the terminals in contact andhence from causing intermittent separations and consequent chatteringofsaid terminals. When the armature is in ma netic circuit with the magnetcore, as is ere shown, the'device becomes more sensitive and thereforethis construction is preferable.

I claim:

1. A source of alternating current, an electro magnet coil energizedthereby, an armature therefor and a resilient abutment for said armatureconstructed to absorb the vibrations thereof due to current alternationsin said coil.

2. A source of varying current, an electroma net coil, an armature,means for mechan ical y equilibrating the attraction of said magnet'u onsaid armatureand for taking up the vi rations of said armature due tocurrent variations in said coil.

3. A. source of varying current, anelectro magnet coil,-an armature, anda spring for equllibratmg the attraction of sai magnet upon saidarmature and for taking up the vibrations of said armature due tocurrent variations in said coil. H

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

DAVID L. LINDQUIST.

